http://www.w3.org/Bugs/Public/show_bug.cgi?id=4176
------- Comment #2 from martin@x-hive.com 2007-01-11 12:59 -------
In do insert ... (as first | as last) into ... you can do a lookahead and
decide because of the following 'first into' or 'last into', as those would be
syntax errors in the itemtype state (however if there would only be one word
following, that would be a problem...).
I do second the idea of a function-based syntax. I implemented a custom syntax
for updates using functions (which are extremely close to this spec, except for
the syntax) before this spec was publicly available, and users seem to adapt to
it without much problems.